Question about IBM ThinkPad T21 Notebook

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Suspend light I've replace the lcd and inverter....still a dark screen..but i noticed the suspend light is lit...now what?

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Is your laptops motherboard and vga chipset working? Please try to connect the laptop to another monitor if you are unable to get any image out it might be that the 2nd output is disable OR your motherboard or vga chipset has failed.

If the laptop works on another monitor, then there is still something wrong on the lcd.

But I think there is a more serious problem.

if you need more assitance let me know. good luck.

Posted on Apr 02, 2008

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Why does my TCL tv stay dimmed and very dark screen? I've reset it and everything?


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
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To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

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This sounds like the back-lights have quit working. This is made up with an inverter (ballast) and fluorescent lamps. I want you to try something. In a very dark room turn the tv on and watch what happens to the screen. There is three things that can happen. first the screen will stay completely black. This means the inverter never fired, and this is usually a failed inverter, but sometimes the power supply may fail. there is also a rare time the main module never outputted the signal to activate the inverter, but this is rare because you can hear the audio. So obviously the main is working at least 90%. The second thing that can happen is the screen will light for a split second then go black. This usually means that you have a bad lamp. These lamps are physically locate inside the LCD panel, and the replacement cost exceeds the price of a new unit. You may even see a dark area in the screen. The slight glow will not be uniformly lit through out the screen. Finally the last thing you may see is the screen has a slight glow. This means the back-lights work, but the video portion isn't showing. This usually means the driver board (T-con) has failed. This is probably not available separately, so you must replace the panel to fix it. And like before, the replacement cost exceeds the price of a new unit. One more thing to do when the set is on and in the very dark room if the screen is black, point a very intense flashlight into the screen. Put the flashlight against the lcd screen and see that you have video moving around the glow of the flashlight.

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Hello,

The problem is not with the screen. If you turn on your laptop in a dark room and you put a flashlight on your screen, you will get a very faint display. The problem seems to lying with the inverter.

The inverter is a electrical device which 'backlits' the LCD and gives the display. Without the inverter and the bulbs it powers, the screen would be too faint to be seen.

To test if the inverter is defective, just turn on your laptop in a dark space, then put a flashlight on the screen to see if you have a fainted display. If you can see something, it is the inverter which is defective and should be replaced.

If you are handy, you can also remove the screen cover to see if there is a neon like light which lits up behind the LCD. If you can see the light, it means that the inverter is just working fine and that the is with the LCD itself.

jbertrand_ba.jpg
Picture of an inverter.

Replacing the inverter:

1. After removing the screen 'cover', locate a small circuit board (usually below the LCD). Unplug the electrical cables and replace.

In your case, as the LCD has been replaced, check if the cables are well connected to both ends of the inverter. If the cables are well connected, consider replacing the inverter.

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1 Answer

Laptop screen is very dim. There is a very faint image. The LCD screen is brand new so that's not the problem


Hello,

As per your description, it is probably your inverter which is faulty.

The inverter is an electrical device which 'lits' the LCD. Without the inverter and the bulbs it powers, the screen would be too faint to be seen correctly.

To test if the inverter is defective, just turn on your laptop in a dark space, then put a flashlight on the screen to see if you have a fainted display. If you can see something, it is the inverter which is defective and should be replaced.

If you are handy, you can also remove the screen cover to see if there is a neon like light which lits up behind the LCD. If you can see the light, it means that the inverter is just working fine and that the is with the LCD itself, but if there is no light coming from behind the LCD, then you need to replace the inverter.

jbertrand_ba.jpg
Picture of an inverter.

Replacing the inverter:

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Hello,

As per your description, there are two possible causes. Either the LCD is out of order and needs to be replaced, or that the inverter is defective.

The inverter is a electrical device which 'lits' the LCD. Without the inverter and the bulbs it powers, the screen would be too faint to be seen.

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If you are handy, you can also remove the screen cover to see if there is a neon like light which lits up behind the LCD. If you can see the light, it means that the inverter is just working fine and that the is with the LCD itself.

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Picture of an inverter.

Replacing the inverter:

1. After removing the screen 'cover', locate a small circuit board (usually below the LCD). Unplug the electrical cables and replace.

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Look at the LCD screen very closely and check if you can see a faint image on the screen. It's possible that the LCD lid close switch stuck in the "closed" position and the back-light stays off even when you open the LCD screen or turn on the laptop. The switch turns off the back-light when you close the LCD display to save the laptop battery power.

If no luck, try to remove battery and drain the power, then replace battery and turn on.

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Hi, My laptop sony vaio came from repairing with a new LCD, the old one had a dark spot and they changed it. When the new one came i noticed it had half the screen lighter than the other half, and it's...


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System on but screen dark


I had this problem with my Dell laptop as well. It may not be the solution, but if your laptop is older, the LCD power inverter may be burnt out. If that's the case, it's about a 50 dollar fix. See if you can take a flash light to the screen and if you can see what's on the screen, but it's very dark, this LCD inverter may be the problem.

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